Engine turning means



Nov. 13, 1945. w. SCHMIDT ENGINETURNING MEANS File'd Sept. 16, 1944 9 3nventor e771 21250111111112 I Cittornega Patented ,Nov. 13, 1945 f UNITED ,STAT'ES' PATENT OFFICE r I W 2,388,803 I I v 'ENGINE 'T URNING MEANS r 7 Henry w. Schmidt; Wilmette, 111., assignor to. General Motors Corporation, Detroit, Mich., a corporation of Delaware 7 I 7 Application September 16, 1944, Serial No. 554,525

. 2 Claims. (erase-131) The present invention relates to engine turning,

devices and more particularly to portable turning means and the mounting means therefor.

The principal object of the invention is to provide portable manually operable turning means comprising few parts and engine mounting means therefor whereby the engine may be easily turned in either direction of rotation and which prevents counter rotation due to compression or backfire to prevent injury of the operator.

- The means by which this object is accomplished and the novel features thereof will become apparent by reference to the single sheet of drawings illustrating the details and the detailed description of the invention.

Figure l is an end elevation view showing the turning means and the mounting means therefor provided in an engine.

Figure 2 is an enlarged view similar to Figure 1 with certain parts broken away to show details of the turning and mounting means therefor to better advantage and,

Figure 3 is a sectional view taken on line 3-3 of Figure 2.

As best shown in Figure '1 of the drawing the turning means is a simple portable turning jack, indicated generally at I, which is adapted to be inserted in either of two socket members 3, each of which is secured below and to one side of a flywel eel 5 of an engine I on engine supporting memb s 9.

As best shown in Figures 2 and 3 of the drawing each socket member 3 is provided with an arcuate depression I I extending parallel to the axis of rotation of the engine flywheel 5. The

ends of the depression are closed by end plates v I3 secured to the socket members 3. The jack I is provided with a tubular foot member I5 shown in the right-hand socket depression II. A pair of vertical plates I! are secured at the central bottom portion thereof in parallel transverse relation to the foot member. The ends of the plates I'l adjacent the engine flywheel 5 are interconnected by a cross pin I9 and are interconnected by a handle 2| at the outer end. The plates IT are provided with aligned transverse openings located equidistant on opposite sides of the foot member I5 on which pivot pins 23 are mounted. Pawls 25 and 21 of unequal length are pivoted on the pivot pins 23 between the plates and are shown extending upwardly therefrom. The position of the sockets 3 below and to one side of the flywheel 5 causes the upper end portions of the unequal length pawls to fall materially into contact with the periphery of the flywheel 5. The

upper ends. of the pawls are formed so that they drop part way into equally spaced radial openings 29 provided in the periphery-of the flywheel when the pawls are moved upwardly with respect to the openings and to be moved outwardly of the openings when moved downwardly with respect thereto. With the jack in the position shown in Figure 2, the upper end of the shorter pawl 25 has fallen into an opening in the flywheel so that when the jack is rotated by the handle 2| clockwisein the right-hand socket 3 the shorter pawl 25 will be moved upwardly and cause counterclockwise movement of the flywheel 5 and the longer pawl 21 will move downwardly and fall into the flywheel opening immediately above the opening in which the shorter pawl is entered so that when the jack is subsequently rotated in the opposit or counterclockwise direction in the socket 3 the longer pawl 21 will be moved upwardly and likewise cause counterclockwise rotation of the flywheel and the shorter pawl 25 will be moved downwardly out of the opening it was in and fall into the second opening below the opening the longer pawl 21 is in to again cause counterclockwise movement of the flywheel and downward movement of the longer pawl 21 out of the opening it is in when the jack is again rotated clockwise about the pivot, It will be evident that should the engine flywheel tend to turn counterclockwise with respect to the ends of the pawls due to compression or explosion in the engine cylinders the pawls will be moved outwardly of the flywheel opening and permit rotation in this direction but upon clockwise rotation for the same reasons both pawls will fall into separate flywheel openings and as the pawls are pivoted to the jack at points equidistant from the jack foot, clockwise rotation of the engine will be blocked by the jack.

Conversely if the jack is supported in the lefthand socket 3 clockwise rotation of the engine is caused by oscillation of the jack handle and the pawls are disengaged from the flywheel openin by rotation of the engine in this direction by compression or explosion pressure in the cylinders and counterclockwise rotation is blocked by both pawls falling into separate flywheel openings.

The above described portable jack comprises few lightweight parts and when mounted in the sockets in thepositions described enables large engines to be easily turned in either direction and also acts to block movement in the opposite direction thereby preventing injury to the operator due to movement of the engine by the pressure in the cylinders.

I claim:

1. The combination of an engine having a rotary member provided with angularly spaced depressions, socket members fixed on opposite sides of the axis of rotation of said member, manual turning means adapted to be supported for oscillatory movement in either socket, said means having pawls pivoted thereon at points on opposite sides of the point of support in either socket so that eachof said pawls will fall naturally into a depression in said member upon one-way oscillation of said means and remain therein upon 0scillation of means in the opposite direction in order to cause rotation of said member in one direction when said means is oscillated in one socket and to cause rotation in the opposite direction when said means is oscillated in the other socket.

2. The combination of an engine having a flywheel provided with peripheral depressions, a pair of stationary socket members located below and equidistant on opposite sides of the axis of said flywheel, a jack adapted to be supported in either socket for oscillatory movement therein, said jack having a handle and provided with two pawls pivoted at points equidistant on opposite sides of the point of support of said jack in either socket so that each pawl will fall naturally into a flywheel depression upon oscillation of said jack by said handle in one direction and remain in said depression upon oscillation of said jack handle in the other direction to cause rotation of the flywheel in one direction when said jack is oscillated T in one socket and to cause rotation of the flywheel both of said pawls also being adapted to fall natw urally into separate depressions on one side of said member upon slight rotation of said member opposite to that caused by oscillation of said means inv either socket and thereby block further opposite rotation of said member.

in the other direction when said jack is oscillated in the other socket, said pawls also being adapted to both fall into separate flywheel depressions and block rotation of the engine in the opposite direction to that caused by the jack when oscillated in either socket. I r

' HENRY W. SCHMIDT. 

